RESIDENTIAL MORTGAGE LOANS - Carrying Value of Mortgage Loans (Details) $ in Thousands	3 Months Ended
Mar. 31, 2022 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning	$ 11,347,845
Transfer of loans to REO	2,002
Balance, ending	7,202,475
Residential Portfolio Segment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning	11,917,777
Originations	26,618,881
Sales	(32,772,017)
Purchases/additional fundings	2,310,958
Proceeds from repayments	(193,579)
Transfer of loans to other assets	(23,014)
Transfer of loans to REO	910
Valuation (provision) reversal on loans	(3,117)
Changes in instrument-specific credit risk	(6,864)
Other factors	(100,056)
Balance, ending	7,749,879
Residential Mortgage Loans, Held-for-Investment, at Fair Value \| Residential Portfolio Segment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning	569,932
Originations	0
Sales	0
Purchases/additional fundings	7,183
Proceeds from repayments	(22,995)
Transfer of loans to other assets	0
Transfer of loans to REO	(762)
Valuation (provision) reversal on loans	0
Changes in instrument-specific credit risk	(1,810)
Other factors	(4,144)
Balance, ending	547,404
Residential Mortgage Loans, Held-for-Sale \| Loans Held-for-Sale, at Lower of Cost or Fair Value \| Residential Portfolio Segment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning	132,921
Originations	0
Sales	(720)
Purchases/additional fundings	0
Proceeds from repayments	(4,480)
Transfer of loans to other assets	0
Transfer of loans to REO	955
Valuation (provision) reversal on loans	(3,117)
Changes in instrument-specific credit risk	0
Other factors	0
Balance, ending	125,559
Residential Mortgage Loans, Held-for-Sale \| Loans Held-for-Sale, at Fair Value \| Residential Portfolio Segment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning	11,214,924
Originations	26,618,881
Sales	(32,771,297)
Purchases/additional fundings	2,303,775
Proceeds from repayments	(166,104)
Transfer of loans to other assets	(23,014)
Transfer of loans to REO	717
Valuation (provision) reversal on loans	0
Changes in instrument-specific credit risk	(5,054)
Other factors	(95,912)
Balance, ending	$ 7,076,916

Investment in Mortgage Loans on Real Estate, Originations

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Mortgage Loans on Real Estate, Fair Value Adjustment, Credit Risk Evaluation

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Mortgage Loans on Real Estate, Fair Value Adjustment, Other

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Mortgage Loans on Real Estate, Transfer of Loans to Other Assets

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Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from collection of principal.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 6
-Subsection 29

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-Name Accounting Standards Codification
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Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from sale.

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Amount of increase in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from new investment.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of expense related to estimated loss from loan and lease transactions.

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-Publisher FASB
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-Topic 230
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Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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